Grinding wheel truing apparatus



April 13, 1937. G. E. HULBERT 2,077,363

GRINDING WHEEL TRUING APPARATUS Filed Aug. 7, 1955 A III! mm I FIG]GEUR'GE E. HL/L BER T vii/Mm Gum/mug Patented Apr. 13, "1937 UNITED.STATES 2,011.30: GRINDING wnssr. raumo srrsaarus George E. Hulbert,Westboro, Mass., assignor to Norton Company, Worcester, Mass atcorporation of Massachusetts Applicationjugust '7, 1935, Serial No.35,121

* 7 clams. to]. 1215-11) This invention relates to grinding machines, y

and more particularly to a grinding wheeltruing apparatus for truing theoperative face of a manually or by power, by any well-known wheelrinding wheel. I One of the objects of this invention is to provide-asimple, thoroughly practicable grinding wheel truing apparatus fortruing the operative face of a grinding wheel.

Another object of thisinvention is to provide a truing. apparatus of asimple and rugged cor.-

struction which enables the truing of the side face of a grinding wheel.

It is another 'object of this invention'to provide a truing apparatuswhich is arranged to true the two opposed operative side faces of agrinding wheel.

Another object of this invention is to provide a simplified truingapparatus with which the opposedoperative side-faces as well as the pe-2o ripheral face of the grinding wheel may be accurately trued.-

, Otherobiects will be in part obvlcus'or in part pointed outhereinafter. I

'I-his invention accordingly consists in the fea- 25 tures ofconstruction, combinations of elements,v

and arrangements of parts as will be exemplified in the structure to behereinafter described, and the scope of the application of which will beindicated in the following claims.

so In the accompanying drawingin' which is shown'one of the variouspossible embodiments of the mechanical features of this invention,

Fig." 1 is a fragmentary front elevation of a grinding machine "showingthe improved truing 5 apparatus in operative position to true the sideface of the grinding wheelyand 1 Fig. 2 is a fragmentary cross sectionalview showing the truing apparatus in position for truing the peripheralsurface of the grinding wheel. 40 The embodiment of the inventionselected for illustration comprises a grinding machine having a base IIIwhich supports a longitudinally movable work supporting table II on theusual 'V-way I2 and fiat way I3. A rotatable grinding wheel I4is-supported on a wheel spindle I5 which is rotatably journaled in awheel .slide I6. The wheel'slide I. is arranged for a transversemovement relative to the base II and is supported thereon by ways:

50 I1. The slide It may be moved transversely relative to the base byafeeding mechanism which comprises a depending half nut I3 on the slideI6 which meshes with a rotatable feed screw is rotatably supported inbearings in the 55 base is of the. The front end of the invention.

screw I3 is provided with a gear 2| meshing with a gear 22 mounted onthe inner end of a rotata able shaft'23. The shaft 23 may be rotated,either feeding mechanism such as, for example, that 5 shown in theexpired U. S. patentto Norton No. 762,838 dated June 14, 1904. The feedmechanism serves when rotated to turn the cross feed screw I3 and causea transverse movement of the grinding wheel I4 either toward or from 10]tration, however, the work table is provided witha pair of opposed worksupporting heads 30 and 3| having rotatable spindles 32 and .33 which inturn support rotary work holders 34 and 35 respectively. The workholders 34 and 35 are I arranged to support the opposite ends of a workpiece and are provided with clamping members 33 and 31 which servetorigidly clamp a work piece in operating position on themachine. Thedetails of construction f the work supporting heads 33 and 3I and thework holders 34, and "have not been illustrated in the present case,since these are not considered parts of the present For further detailsof the construction of the head and work holders, reference may be hadto the prior patent to Silven, et al. No. 1,837,342 dated December 22,1931.

The work table II is slidably mounted on the ways I2 and I3 of base II)to permit, a longi-' tudinal movement of the work piece relative to thegrinding wheel to position the work in the 40 desired'relation with theoperative face of the grinding wheel. A. manually operable mechanism isprovided *for moving the table II longitudinally relative to the base1.0. This mechanism comprises a rack bar 31 depending from '4 the tableII. The rack 37 mesha with a gear 33 which is mounted on the inner endof a rotatable shaft 33. The-shaft 33 also supports a gear 40 whichmeshes with a gear 4| mounted on the inner end of a rotatable shaft 42.The outer end of shaft 42 is provided with a manually operable handwheel 43 which serves through the train of gears and rack, abovedescribed, 7 to cause a longitudinal positioning movement of the tableII relative to the grinding wheel I4.

In the grinding of work pieces, such as crankpins on a multiple throwcrankshaft, it is necessary-not only to grind the cylindrical body ofthe crankpintothe desired size and finish but it is also necessary togrind the checks or side end faces adjacent to the ends} of thecrankpinso that the distance between the cheeks comes within the requiredlimits. To accomplish this re-.- sult, it is desirable to provide agrinding wheel with an operative peripheral surface for grinding thebody or cylindrical portion of the crankpin and to provide such a wheelof a thickness which will-grind the cheeks of the pin to the requireddimensions. It is accordingly desirable to-provide a' truing apparatusfor not oniy-tming the periphery of the grinding wheel but which isadapted to also true one or both side faces thereof to true the wheel tothe required thickness to produce the crankpin and cheeks of therequired dimensions. In the embodiment of the invention illustrated.this apparatus comprises a supporting shaft 50 which-as illustrated inthe drawing has its opposite ends clamped rigidly in the work heads 35and 35 by means of the work clamps 36 and 31. A rotatable sleeve 5| isrotatably supported on the shaft and'is held in an ad'- justedlongitudinal position thereon by means of a flange 52 which is formed asan integral part ofthe shaft 59. The-sleeve 5| is held in place on theshaft 58 in the proper relation with the fixed flange 52 by means ofanadjustable collar 53 which is adjustably supported on the other end ofshaft 50 by means of a threaded portion 54.

The sleeve 5| is provided with upwardly ex-' tending bosses 55 and-55each of which is provided with an aperture 51 and 58 respectively whichare arranged with their axes at right angles to the axis of the sleeve5| and shaft 50.. A truing tool holder 59 and 50 are supported in theapertures 51 and 58 and locked in adjusted position relative thereto bymeans'of clamping screws GI and 52 respectively. Theouterends of theholders 59 and 68 serve to adjustably sup:

port a truing tool,'such as a-diamond truing tool and 68 respectivelywhich are held in adjusted position thereon by clamping. screws 61 and68 so that the .truing tools or diamonds may be readily removed andreplaced when desired or adjusted relative to the holders.

The manually operable leverv 15 is provided to rockthe' sleeve 5|relative to the shaft 59 soas .to swing the diamonds 85 or, man arcuatepath. across a portion of the oppositeside face. of the grinding wheelI4. -fI'he lever 15 is copnected to an adjustable collar 18 whichsurrounds the sleeve 5|. The collar 15 is provided with a centralaperture 11 which snugly fits the outer diameter of the sleeve 5| and ispreferably split as .shown at 18 and arranged to be clamped in adjustedposition on sleeve 5| by means of a ing tool from by swinging thediamond in anarcuate path across a portion of the side face of thegrinding .wheel M.

An adjustable stop 85 is provided to limit the movement of the lever 15in one direction. The stop 85 is adjustably supported on a base member86 which is provided with a dovetailed surface 81 mating with acorrespondingly dovetailed 88 on table II and arranged to be attachmentin a definite position on the work table II.

In order that the diamonds or'truing tools 55 and 55 may be located inpredetermined positionsrelative to the grinding wheel I for successivetruing operations, it is desirable to provide a suitable locating meansfor accurately positioning the table II relative to the base iii. In theembodiment illustrated in the drawing, such a mechanism may comprise astop 95 which is pivctally connected on a stud 95 on the base Hi. The

stop 95 is shown in full lines in its operating position.\ When thisstop 95 is not required, it may he s downwardly about its pivot 96 intoa position 95a, as illustrated in dotted lines in Fig.

I 1. The table l, is provided with adjustable dogs 91 and 98 which areadjustably clamped to table II by screws 99 and I08 respectively. Thedogs 91 and 98 are each provided with an adjusting screw |0| and I82respectively, which are arranged to engage the side faces of the stopblock 95 to definitely locate the diamonds 65 and 55 in a predeterminedposition relative to the wheel I. As illustrated in Fig. 1, the table IIhas been moved toward the right, by means of the hand traverse. wheel43, so that the screw |0| of do; 91 is in engagement with the stop 95.This serves to locate diamond or truing' tool 55 in a. predeterminedposition for truing the left-hand side face of the grinding wheel It. Totrue this side face of the wheel, the lever," is rocked from the fullline position (Fig. 2) into position 15a toward theleit, as viewed inFig. 1, by means of.

the hand traverse wheel 43 until the stop screw N2 of dog 98 engagesthe'stop 95 which serves to accurately position the diamond or truing'tool 56 relative to the right-hand end face of the grinding wheel H. Bya similar rocking movement .of the sleeve 5| by means of the lever 15,

the'diamond 56 may be then swung in an armate path across a portion ofthe side face of grimiing'wheel H to true itsTight-hand end face. asviewed-in Figgl; It will be readily apparent from the foregoingdisclosure that by adjustment of the screws ||l| and I02, the positionof the truing tools and 65 may be varied so as to true the side faces ofthe grinding wheel II to the desired extent.

It is also desirable to provide the truing ap- 'paratus with a thirddiamond or truing tool 8 mounted in a holder which is held in positionoh the sleeve 5| in an aperture in an outwardly.

extending boss 2 by means of a, clamping screw H3. To true theperipheral face of the grinding wheel, the lever -15 is held in the fullline position (Fig. 2) so that the diamond l8 engages theperipheralsurface of the wheel I! at a point lying substantially in the horizontalplanes passing through the axes of the wheel and work holders. In thisposition of the parts, the table II may be traversedby means of thetraverse wheel 48 to pass'the diamond HI across'the peripheral face ofthe wheel ll. The wheel I 4 may be fed into the diamond I ID to therequired extent by turning or truing tool 65 or 66 is in operativeposition, the

diamond III) will be out of contact with the peripheral surface of thewheel.

- In the embodiment of this invention illustrated and described, threetruing tools or diamonds have been illustrated, one for truing each sideface of the wheel and the third for truing the periphery of the wheel,it being understood that this mechanism is adapted for operation fortruing asingle surface of the wheel, that is, either the periphery orone side face of the wheel or any combination of the operative faces ofthe wheel.

In the operation of this truing apparatus, the.

assembled truing apparatus is placed in operative position in themachine with the shaft 50 supported in the work holders 34 and 35. Theate tachment is then clamped in operating position with the collar 52 upagainstthe locating portion h 90 of the work holder 31. The stop 95isthen swung into an operating position and the table l l traversedlongitudinally into the position illustrated in Fig. 1 so that theleft-hand side face of' the grinding wheel may be trued, then the tableH is traversed toward the left to position the truing tool 66 inoperative position relative to the right-hand end face of the wheel Itto true the same. The lever I5 is then held in engagement with stop 85while the grinding wheel II is fed transversely to bring the peripheralface of the grinding wheel l4 into contact with the diamond or truingtool H9 and the table II is then traversedto pass tool H0 across theperipheral face of the wheel 14 to true the same. After this truingoperation has beencompleted, the truing attachment may be readilyremoved from the machine by releasing the clamps 36 and 31 and;

lifting the attachment bodily from the work holders 34 and 15. v

' It will thus be seen that there has been provided by this invention atruing apparatus in which the various objects hereinabove set forthtogether with many thoroughly practical advantages are successfullyachieved. As many possible embodiments may be made of theabove'invention and as many changes might o be made in the embodimentabove set forth, it is to be understood that all matter hereinbefore setforth, or shown in the accompanying drawing, is to be interpreted asillustrative and not in a limiting sense.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is: v

1. A grinding machine having a transversely movable rotatable grindingwheel, a longitudinally movable work table; means to traverse said tableacross the side face of the grinding wheel to true the same.

2. A grinding machine having a base, .a transversely movable rotatablegrinding wheel, a

longitudinally movable work table, means to traverse said tablelongitudinally,'a rotatable work support thereomand a-truing apparatustherefor comprising a supporting member arranged to be held by said worksupport, a sleeve rotatably mounted on said member, a truing toolcarried by said sleeve, a fixed stop on said base and an adjustable dogmounted on said table and arranged 'to locate the truing tool in apredetermined position with relation to the side face of the grindingwheel, means to rock said sleeve to pass the truing tool in an arcuatepath across the side face of the grinding wheel, a second truing tool onsaid sleeve. and means including a second adjustable dog arranged toposition said table-to locate the second truing tool in a predeterminedposition with the opposite side face of the grinding wheel to true theopposed side face of the wheel.

3. A grinding machine having a base, a transversely movable rotatablegrinding wheel,- a longitudinally movable work table, manually operablemeans to traverse said table longitudinally, a

rotatable work support thereon, and a truing apparatus thereforcomprising a rotatable supporting member, a pair of truing toolsadjustably mounted on said support in spaced relation to each other andarranged to true the opposite side faces of a grinding wheel, a stop onsaid base and a pair of opposed adjustable dogs on said table, andadjusting means on said dogs to precisely locate said table tosuccessively position each of said truing tools in a predeterminedposition relative to the opposite side face of the grinding wheel, andmeans to rock said member, successivelyto pass the truing tools in'arcuate paths across the opposed side faces of the grinding wheel totrue the same.

4. A grinding machine having a base, a trans versely movable rotatablegrinding wheel, a =longitudinally movable work table, a rotatable worksupport thereon, and a truing apparatus therefor comprising a supportingmember arranged to be held by said work support, a sleeve rotatablymounted on said member, a pair of spaced radially extending. projections.on said sleeve, a truing tool adjustably mounted on each of said armsposition said sleeveto locate said third truing tool in a predeterminedposition with relation to the wheel, and means to move the grindingwheel transversely toward thethird truing tool'while the table istraversed to true the peripheral face of the grinding wheel.

5. A truing apparatus for grinding machines comprising a supportingmember having spaced aligning and supporting surfaces adjacent to theopposite ends thereof which are arranged to be supported on a pair ofspaced opposed work holders, a sleeve rotatably mounted on said member,

;a pair of spaced radially eiten'ding arms on said sleeve, a truing tooladiustably mounted in each of said arms and arranged to true theopposite side faces of a grinding wheel when the sleeve is 5 rocked, aboss on said sleeve, and a truing tool adiustably supported by said bosswhich. is ar ranged to true the peripheral face of said grinding wheel.I

6. A truing apparatus for grinding machines .10 comprising a supportingmember having spaced aligning and supporting surfaces thereon adjacentto its opposite ends, a sleeve rotatably mounted on said member; a pairof spaced thrust collars on saidsupporting member which are arl rangedto locate said sleeve on said member, at least-one of said collars beingadJustable to take up theend thrust betweensaid member-and sleeve, apair of spaced radially extending arms on said sleeve, a truing tooladjustahly mounted 20 on each of said arms and arranged to true theopposite side faces'oi' a grinding wheel when the sleeve is rocked, anda,manually operable lever adiustably mounted on said sleeve to rock saidsleeve to pass the truing tools in an arcuate path acre-sea across theopposite plane side faeesof the grinding wheel.

7. A truing apparatus for grinding machines comprising a supportingmember having spaced aligning and supporting surfaces thereon adjacentto its opposite ends, a sleeve rotatably mounted on said member, a pairof spaced thrust collars on said supporting member which are to rocksaid sleeve to pass .thetruing tools in an arcuate path across theopposite side faces of the grinding" wheel. v v

GEORGE E. HULBERT.

